Applied Mathematical Modelling最新文献_第8页

A multi-scale dynamics analysis method for the anisotropic single-crystal blade with fretting wear 考虑微动磨损的各向异性单晶叶片多尺度动力学分析方法

IF 4.4 2区工程技术

Applied Mathematical Modelling Pub Date : 2025-08-27 DOI: 10.1016/j.apm.2025.116418

Ao Liu , Houxin She , Yan Jiang , Chaoping Zang , Chaofeng Li

引用次数: 0

On the inferential consequences in the selection of fractional derivatives 论分数阶导数选择的推论结果

IF 4.4 2区工程技术

Applied Mathematical Modelling Pub Date : 2025-08-27 DOI: 10.1016/j.apm.2025.116386

Luis Alfonso Caraveo-Balderas , José A. Montoya , L. Leticia Ramírez-Ramírez

{"title":"On the inferential consequences in the selection of fractional derivatives","authors":"Luis Alfonso Caraveo-Balderas , José A. Montoya , L. Leticia Ramírez-Ramírez","doi":"10.1016/j.apm.2025.116386","DOIUrl":"10.1016/j.apm.2025.116386","url":null,"abstract":"<div><div>The challenge of model selection arises when multiple models appear suitable for modeling the same phenomena. Deciding on the best fractional derivative for models based on fractional differential equations relies on the fit with experimental data. However, data fit does not consider the inferential performance of the models. This paper proposes an enhancement of the standard approach by incorporating statistics and statistical tests to evaluate additional inferential aspects. From this statistical perspective, we evaluate and compare fractional models using the Caputo, conformable, and Caputo-Fabrizio derivatives. We present three model scenarios based on linear, exponential, and logistic growth. For each model scenario, we compare the coverage frequency and length of the confidence intervals; the bias and the mean square error of the estimators; the trade-off between estimation precision and efficiency; and the performance of Type I error and the power when considering hypothesis tests. The statistical methods we use to compare the three competing fractional models include a likelihood-based approach, an identifiability analysis, and simulation studies. Our results show identifiability problems for the Caputo-Fabrizio derivative. For the Caputo and conformable derivatives, we demonstrate a better or comparable performance of the statistical estimators, confidence intervals, and hypothesis tests, depending on the model scenario under study although the efficiency shows evidence for selecting any fractional derivative. We conclude by presenting a real-world problem in an ecological context involving body mass growth, where the ordinary model is rejected based on the data, although efficiency does not reflect this decision.</div></div>","PeriodicalId":50980,"journal":{"name":"Applied Mathematical Modelling","volume":"150 ","pages":"Article 116386"},"PeriodicalIF":4.4,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144987920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamic modeling and analysis for a large flexible spacecraft with antenna trusses and solar wings 具有天线桁架和太阳翼的大型柔性航天器动力学建模与分析

IF 4.4 2区工程技术

Applied Mathematical Modelling Pub Date : 2025-08-27 DOI: 10.1016/j.apm.2025.116405

Yang Yang , Zhongxiao Zhang , Mei Liu , Hesheng Han , Jin Wei , Dengqing Cao

{"title":"Dynamic modeling and analysis for a large flexible spacecraft with antenna trusses and solar wings","authors":"Yang Yang , Zhongxiao Zhang , Mei Liu , Hesheng Han , Jin Wei , Dengqing Cao","doi":"10.1016/j.apm.2025.116405","DOIUrl":"10.1016/j.apm.2025.116405","url":null,"abstract":"<div><div>In this paper, a reduced-order analytical dynamic model is proposed for a large flexible spacecraft with antenna trusses and solar wings by using the global mode method (GMM). Firstly, the equations that govern motion for the solar wings, antenna trusses, and center platform are obtained, respectively. By applying the matching and boundary conditions, the characteristic equation of the system is derived to determine the natural frequencies and mode shapes of the spacecraft, and the orthogonality of the mode shapes is demonstrated. By using the mode shapes and their orthogonality, the reduced-order decoupled dynamic equations of the spacecraft are obtained. The natural frequencies calculated by the frequency equation are compared with those obtained by the finite element software ANSYS to verify the GMM model proposed in this paper. The influences of the slight inconsistencies in the stiffness of the solar wings and the antenna trusses on the dynamic behavior of the spacecraft for two cases are analyzed. The results reveal the internal mechanism of mode localization, mode mistuning, and mode change of the spacecraft, as well as the significant impact of the slight inconsistencies in the stiffness of the solar wings and antenna trusses on the vibration responses of the spacecraft.</div></div>","PeriodicalId":50980,"journal":{"name":"Applied Mathematical Modelling","volume":"150 ","pages":"Article 116405"},"PeriodicalIF":4.4,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144920171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Traffic prediction by combining macroscopic models and Gaussian processes 结合宏观模型和高斯过程的交通预测

IF 4.4 2区工程技术

Applied Mathematical Modelling Pub Date : 2025-08-27 DOI: 10.1016/j.apm.2025.116397

Alexandra Würth, Mickaël Binois, Paola Goatin

引用次数: 0

Efficient tracking of ocean eddies using unmanned underwater vehicles 使用无人水下航行器有效跟踪海洋涡流

IF 4.4 2区工程技术

Applied Mathematical Modelling Pub Date : 2025-08-27 DOI: 10.1016/j.apm.2025.116392

Hanbin Zhang , Dalei Song , Jiangli Cao , Wenshan Yu , Wenchuan Zang

{"title":"Efficient tracking of ocean eddies using unmanned underwater vehicles","authors":"Hanbin Zhang , Dalei Song , Jiangli Cao , Wenshan Yu , Wenchuan Zang","doi":"10.1016/j.apm.2025.116392","DOIUrl":"10.1016/j.apm.2025.116392","url":null,"abstract":"<div><div>Unmanned underwater vehicles deployed in formations for eddy measurement enhance spatial resolution and temporal continuity. However, coordinating unmanned underwater vehicle swarms presents significant challenges in accurately solving the optimization problem of maintaining high-coverage observation formations, subject to time-varying constraints imposed by dynamic eddy migration and turbulent environmental disturbances. This work proposes a hybrid framework for unmanned underwater vehicle swarm tracking of dynamic ocean eddies. The Lyapunov Guidance Vector Field generates stable guidance commands via rotational vector fields to maintain an equilateral formation, while Policy Optimization with Collaborative Adaptation optimizes real-time corrections for vortex migration and turbulence. A bidirectional collaborative mechanism facilitates parameter adaptation between modules, while Lyapunov-based constraints bound correction ranges to suppress high-frequency oscillations. Simulations and physical experiments demonstrate the effectiveness of the proposed method, achieving a spatial-temporal uniformity improvement of approximately 32.5% in static tracking scenarios and 36.5% in dynamic tracking scenarios compared to traditional methods. This work enhances unmanned underwater vehicle navigation control, improving eddy observation quality. Incorporating artificial intelligence increases automation in swarm planning, providing an effective solution for ocean eddy observation and improving oceanographic observation accuracy.</div></div>","PeriodicalId":50980,"journal":{"name":"Applied Mathematical Modelling","volume":"150 ","pages":"Article 116392"},"PeriodicalIF":4.4,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144911978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Practical multi-material decomposition method for variable threshold micro-focus photon-counting cone-beam CT 变阈值微聚焦光子计数锥束CT的实用多材料分解方法

IF 4.4 2区工程技术

Applied Mathematical Modelling Pub Date : 2025-08-27 DOI: 10.1016/j.apm.2025.116399

Yue Yang , Chuwen Huang , Zheng Sun , Hongwei Li , Wei Zhang , Xing Zhao

{"title":"Practical multi-material decomposition method for variable threshold micro-focus photon-counting cone-beam CT","authors":"Yue Yang , Chuwen Huang , Zheng Sun , Hongwei Li , Wei Zhang , Xing Zhao","doi":"10.1016/j.apm.2025.116399","DOIUrl":"10.1016/j.apm.2025.116399","url":null,"abstract":"<div><div>Micro-focus photon-counting cone-beam computed tomography (MF-PCCBCT) utilizes a micro-focus X-ray source and a flat-panel photon-counting detector (PCD) to simultaneously acquire high-resolution multi-energy projections of the measured object by setting different energy thresholds on the PCD. This technique has significant applications in medical imaging, including microcalcification detection, bone microstructure analysis, and small animal imaging. However, due to hardware cost and anti-noise performance considerations, some commercial PCDs currently include only a single high-energy threshold, meaning that only projections from two energy bins of the measured object can be collected at a time, restricting their multi-material decomposition (MMD) capabilities. To address this limitation, we propose a practical variable-threshold circular scanning mode, taking advantage of the long scanning period of a micro-focus X-ray source. In this mode, the object is scanned two laps consecutively, and the sampling views of the second lap are staggered with those of the first scan while changing the energy threshold. Consequently, the sample views and projections are doubled without additional hardware and scanning duration. In this scanning mode, the dual-energy projections obtained from the same lap are geometrically consistent, whereas the dual-energy projections from different laps exhibit geometric inconsistency. Thereby, we propose a nonlinear MMD mathematical model based on this scanning mode and a high-precision two-step Levenberg-Marquardt filtered back-projection (TSLM-FBP) algorithm to solve this novel mathematical problem. Finally, numerical simulation and real data experiments demonstrate that the proposed method outperforms existing state-of-the-art model-based approaches and achieves high-precision multi-material decomposition.</div></div>","PeriodicalId":50980,"journal":{"name":"Applied Mathematical Modelling","volume":"150 ","pages":"Article 116399"},"PeriodicalIF":4.4,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144911980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Majorana-like topologically bound states with self-replicating features in elastic structures 弹性结构中具有自复制特征的类马约拉纳拓扑束缚态

IF 4.4 2区工程技术

Applied Mathematical Modelling Pub Date : 2025-08-26 DOI: 10.1016/j.apm.2025.116395

He Liu

{"title":"Majorana-like topologically bound states with self-replicating features in elastic structures","authors":"He Liu","doi":"10.1016/j.apm.2025.116395","DOIUrl":"10.1016/j.apm.2025.116395","url":null,"abstract":"<div><div>In analogy to the Majorana bound state in superconductor electronic systems, a new type of zero-order topological state called Dirac-vortex state has recently been implemented in the photonic and phononic communities as a new strategy to provide tight and robust confinement of classical waves. In the realm of elastic waves, these Majorana-like bound state have been demonstrated as a potential candidate for designing efficient energy harvesting devices. However, previous demonstrations of the Dirac-vortex states are primarily limited to a single frequency (i.e., fixed at a single mid-gap Dirac frequency), which restricts their applicability in scenarios requiring multi-working frequencies. Here, we propose a Kekulé-modulated elastic lattice structure, engineered from fixed-free beams coupled through slender rods, which supports Majorana-like elastic wave topologically bound states spanning multiple frequency ranges. Through a combination of theoretical beam-spring modeling and finite element simulations, multiple Dirac-vortex modes with self-replicating properties are comprehensively confirmed through the analysis of bandstructure and examination of eigenspectra. We present convincing evidence for the high localization and robust confinement of these multi-frequency Dirac-vortex states, which are the key features of nontrivial Majorana-like bound states. The proposed structure, composed of ubiquitous mechanical elements, provides a platform for potential applications such as multi-frequency energy harvesting, on-chip communication, and seismic wave remote sensing.</div></div>","PeriodicalId":50980,"journal":{"name":"Applied Mathematical Modelling","volume":"150 ","pages":"Article 116395"},"PeriodicalIF":4.4,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144911979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the asymptotic form of the posterior probability density function for distributions with polynomial failure rates 多项式失效率分布的后验概率密度函数的渐近形式

IF 4.4 2区工程技术

Applied Mathematical Modelling Pub Date : 2025-08-26 DOI: 10.1016/j.apm.2025.116389

Serguei Maximov , Jose G. Tirado-Serrato , Alfredo Sanchez

引用次数: 0

Semi-analytical modeling of receive transfer function and thermal noise of integrated photonic ultrasound transducers 集成光子超声换能器接收传递函数和热噪声的半解析建模

IF 4.4 2区工程技术

Applied Mathematical Modelling Pub Date : 2025-08-25 DOI: 10.1016/j.apm.2025.116381

Sabiju Valiya Valappil , Peter Harmsma , Maurits van der Heiden , Martin Verweij , Paul van Neer

{"title":"Semi-analytical modeling of receive transfer function and thermal noise of integrated photonic ultrasound transducers","authors":"Sabiju Valiya Valappil , Peter Harmsma , Maurits van der Heiden , Martin Verweij , Paul van Neer","doi":"10.1016/j.apm.2025.116381","DOIUrl":"10.1016/j.apm.2025.116381","url":null,"abstract":"<div><div>Ultrasound transducers (UTs) are extensively used in several applications across a multitude of disciplines. A new type of UTs namely integrated photonic ultrasound transducers (IPUTs) possess superior performance due to the presence of optical interrogation systems, avoiding electric crosstalk and thermal electronic noise of the sensor. However, a major component of the IPUT's noise floor is its thermal acoustic noise. Several studies have been proposed to characterize IPUTs' behavior; nevertheless, these are either incomplete (model only the thermal noise) or targeted to characterize specific responses such as static behavior, in which the modeled receive transfer function (RTF) is about two orders lower than the experiments. In this study, we develop semi-analytical models based on time-domain finite element analysis and analytical expressions to characterize the RTF and thermal noise-induced noise equivalent pressure of IPUTs. We validate the models by comparing them with the literature, where we obtain a close match between them.</div></div>","PeriodicalId":50980,"journal":{"name":"Applied Mathematical Modelling","volume":"150 ","pages":"Article 116381"},"PeriodicalIF":4.4,"publicationDate":"2025-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144907978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modeling SH-wave dynamics in a size-dependent poroelastic-flexomagnetic layered waveguide structure with parabolic interfacial discontinuity 具有抛物界面不连续的孔弹性-柔性磁层状波导结构中sh波动力学模型

IF 4.4 2区工程技术

Applied Mathematical Modelling Pub Date : 2025-08-25 DOI: 10.1016/j.apm.2025.116393

Vipin Gupta , Soumik Das , Marin Marin , Bandar Almohsen , Rachaita Dutta

{"title":"Modeling SH-wave dynamics in a size-dependent poroelastic-flexomagnetic layered waveguide structure with parabolic interfacial discontinuity","authors":"Vipin Gupta , Soumik Das , Marin Marin , Bandar Almohsen , Rachaita Dutta","doi":"10.1016/j.apm.2025.116393","DOIUrl":"10.1016/j.apm.2025.116393","url":null,"abstract":"<div><div>This research explores the behavior of shear horizontal (SH) waves as they propagate through a unique size-dependent configuration where a stratum of fluid-saturated nonlocal fissured porous material overlays a substrate comprising nonlocal flexomagnetic material. The analysis focuses on how parabolic interfacial irregularity, nonlocality, and flexomagnetic effect jointly influence SH-wave behavior. By applying the Fourier transform alongside perturbation techniques, complex frequency relation is determined to describe SH-wave propagation across the irregular interface. The dispersion and damping properties of the waves are extracted from the real and imaginary components of the frequency relation. Key parameters, such as the flexomagnetic coefficient, shape of the interfacial irregularity, porosity, piezomagnetic properties, and nonlocality are evaluated for their impact on wave propagation. The results reveal that parabolic interfacial irregularity and flexomagnetic effects significantly modify SH-wave dispersion and damping characteristics. The study underscores the material-dependent nature of wave propagation in such complex layered systems and validates the proposed model through consistency with established wave propagation theories.</div></div>","PeriodicalId":50980,"journal":{"name":"Applied Mathematical Modelling","volume":"150 ","pages":"Article 116393"},"PeriodicalIF":4.4,"publicationDate":"2025-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144907977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0